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 * Copyright 2002-2021 the original author or authors.
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * See the License for the specific language governing permissions and
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package org.springframework.context;

import org.springframework.beans.factory.Aware;
import org.springframework.core.io.ResourceLoader;

/**
 * Interface to be implemented by any object that wishes to be notified of the
 * {@link ResourceLoader} (typically the ApplicationContext) that it runs in.
 * This is an alternative to a full {@link ApplicationContext} dependency via
 * the {@link org.springframework.context.ApplicationContextAware} interface.
 *
 * <p>Note that {@link org.springframework.core.io.Resource} dependencies can also
 * be exposed as bean properties of type {@code Resource} or {@code Resource[]},
 * populated via Strings with automatic type conversion by the bean factory. This
 * removes the need for implementing any callback interface just for the purpose
 * of accessing specific file resources.
 *
 * <p>You typically need a {@link ResourceLoader} when your application object has to
 * access a variety of file resources whose names are calculated. A good strategy is
 * to make the object use a {@link org.springframework.core.io.DefaultResourceLoader}
 * but still implement {@code ResourceLoaderAware} to allow for overriding when
 * running in an {@code ApplicationContext}. See
 * {@link org.springframework.context.support.ReloadableResourceBundleMessageSource}
 * for an example.
 *
 * <p>A passed-in {@code ResourceLoader} can also be checked for the
 * {@link org.springframework.core.io.support.ResourcePatternResolver} interface
 * and cast accordingly, in order to resolve resource patterns into arrays of
 * {@code Resource} objects. This will always work when running in an ApplicationContext
 * (since the context interface extends the ResourcePatternResolver interface). Use a
 * {@link org.springframework.core.io.support.PathMatchingResourcePatternResolver} as
 * default; see also the {@code ResourcePatternUtils.getResourcePatternResolver} method.
 *
 * <p>As an alternative to a {@code ResourcePatternResolver} dependency, consider
 * exposing bean properties of type {@code Resource[]} array, populated via pattern
 * Strings with automatic type conversion by the bean factory at binding time.
 *
 * @author Juergen Hoeller
 * @author Chris Beams
 * @since 10.03.2004
 * @see ApplicationContextAware
 * @see org.springframework.core.io.Resource
 * @see org.springframework.core.io.ResourceLoader
 * @see org.springframework.core.io.support.ResourcePatternResolver
 */
/**
 *要由希望被通知的任何对象实现的接口
 *｛@link ResourceLoader｝（通常是ApplicationContext）。
 *这是完全｛@link ApplicationContext｝依赖项的替代方案，通过
 *｛@link org.springframework.context.ApplicationContextAware｝接口。
 *
 *<p>请注意，{@linkorg.springframework.core.io.Resource}依赖项也可以
 *作为{@code Resource}或{@code资源[]}类型的bean财产公开，
 *通过字符串填充，并由bean工厂进行自动类型转换。这
 *消除了仅为实现此目的而实现任何回调接口的需要
 *访问特定文件资源。
 *
 *<p>当应用程序对象必须
 *访问其名称经过计算的各种文件资源。一个好的策略是
 *使对象使用{@link org.springframework.core.io.DefaultResourceLoader}
 *但仍然实现{@code ResourceLoaderAware}，以允许在
 *在｛@code ApplicationContext｝中运行。看见
 *｛@link org.springframework.context.support.RoadadableResourceBundleMessageSource｝
 *例如。
 *
 *＜p＞还可以检查传入的｛@code ResourceLoader｝
 *｛@link org.springframework.core.io.support.ResourcePatternResolver｝接口
 *并相应地进行强制转换，以便将资源模式解析为
 *｛@code Resource｝个对象。在ApplicationContext中运行时，这将始终有效
 *（因为上下文接口扩展了ResourcePatternResolver接口）。使用
 *｛@link org.springframework.core.io.support.PathMatchingResourcePatternResolver｝作为
 *违约；另请参阅｛@code ResourcePatternUnutils.getResourcePatternResolver｝方法。
 *
 *<p>作为｛@code ResourcePatternResolver｝依赖项的替代方案，请考虑
 *公开{@code Resource[]}数组类型的bean财产，通过模式填充
 *bean工厂在绑定时自动转换类型的字符串。
 *
 *@作者Juergen Hoeller
 *@作者Chris Beams
 *@自2004年3月10日起
 *@请参阅ApplicationContextAware
 *@参见org.springframework.core.io.Resource
 *@参见org.springframework.core.io.ResourceLoader
 *@请参阅org.springframework.core.io.support.ResourcePatternResolver
 */
public interface ResourceLoaderAware extends Aware {

	/**
	 * Set the ResourceLoader that this object runs in.
	 * <p>This might be a ResourcePatternResolver, which can be checked
	 * through {@code instanceof ResourcePatternResolver}. See also the
	 * {@code ResourcePatternUtils.getResourcePatternResolver} method.
	 * <p>Invoked after population of normal bean properties but before an init callback
	 * like InitializingBean's {@code afterPropertiesSet} or a custom init-method.
	 * Invoked before ApplicationContextAware's {@code setApplicationContext}.
	 * @param resourceLoader the ResourceLoader object to be used by this object
	 * @see org.springframework.core.io.support.ResourcePatternResolver
	 * @see org.springframework.core.io.support.ResourcePatternUtils#getResourcePatternResolver
	 */
	/**
	 *设置运行此对象的ResourceLoader。
	 *<p>这可能是一个ResourcePatternResolver，可以检查
	 *通过{@code instanceofResourcePatternResolver}。另请参阅
	 *｛@code ResourcePatternUnutils.getResourcePatternResolver｝方法。
	 *<p>在填充普通bean财产之后但在init回调之前调用
	 *比如InitializingBean的｛@code afterPropertiesSet｝或自定义的init方法。
	 *在ApplicationContextAware的｛@code setApplicationContext｝之前调用。
	 *@param resourceLoader此对象要使用的resourceLoader对象
	 *@请参阅org.springframework.core.io.support.ResourcePatternResolver
	 *请参阅org.springframework.core.io.support.ResourcePatternUntils#getResourcePatternResolver
	 */
	void setResourceLoader(ResourceLoader resourceLoader);

}
